Not directly related to your post but thought that I’d mention, I have given up on UC. I remained excited for UC during the second half of 2021 and the delay just removed my interest. I used to have a M1 MacBook Air, M1 Mac Mini and an M1 12.9 in iPad Pro. This combination would have been ideal for UC.I know, hence if they have to incorporate it they will need a longer beta cycle in ios 15.4 ??♂️
In late December 2021, I traded the MacBook Air and the Mac Mini and got a M1 Pro 16in MacBook Pro. So now the combination is the new MacBook Pro and the iPad Pro. No longer feel the need for UC since the external display (used with Mac mini) connects directly to the MacBook Pro.
I think the UC fad will hit its peak when it arrives and then dissolve just as fast. At least for me.
Axel F.